Throw-out mechanism for printing-presses.



No. 772,75. `IA'IEN'IED OCT. 18, 1904.

T. C. DEXTER.

THROW-OUT MEGHANISM FOR PRINTING PRESSES.

APPLICATION FILED snPT. 27. 1901. N0 MODEL, I l -a sums-SHEET 1.

PATBNTED'VUGT. 18,' 1904.

y T. c. DEXTER. THROW-OUT MESHANISM PoR PSII-mmv. PRESSES.

` APPLIGATIQN FILED SEPT. 27, 1901.

6 SHEETS-SHEET 2.

4NO MODEL.

uw! v 'a'in ew? u, y HEM 10.772,705. EATENTED 007.18, 1904.

` fr. C. DEXTER.

THROW-OUT MECHANISM EOE PRINTING PRESSES.

APILIOATION FILED SEPT. 27, .1901'.

NO MODEL. 6 SHEETB-SHEVET 3.

. 7/ 173'; V 4 .fuel hun. .J

',PATENTEE 00T. 18, 1904.

T. c. DEXTER. Y THROW-OUT MEGHAN'ISM EOE PRINTING PRESSES.

APPLICATION FILED SEPT. 27, 1901.

6 SHEETS-SHEET 4.

N0 MODEL.

PATENTED OCT. I8, 1904.

T. G. DEXTER. THROW-OUT MEGHANISM POR PRINTING PRESSES.

APPLICATION FILED SERT. 27, 1901.

6 SHEETS-SHEET 5.

N0 MODEL.

ft ',M

' T. C. DEXTER. 1 THROW- OUT MEGHANISM E'oR PRINTING PRESSES. i

APPLIOATIQN TTLED SEPT.27, 1901. v

No MODEL, l @SHEETS-SHEET e.

v @a/fm,-

RATERTED 00T. 1S, 1904.

vUNITRD STATES' Patented October 18, 1904.

PATENT OFFICE.

. TALBOT c. DEXTER, or vPEARL RivRR, Niiw YORK.

THROW-OUT MECHANI'SM FOR PRINTING-PRESSES.

SPECIFICATION forming Apartvof Letterslatent No. '772,705, dated October18p, 1904.. l Application filed September 2'l7, 1901. g Serial Nb.76,728. (No model.) y I To @ZZ whom, it may concern.' i

Be it known that I, TALBorQjDEXTER, a citizen of the United States,residing at Pearl River,- in the county of Rockland and State of NewYork, have invented certain new and useful Improvements in Throw-OutMechanism for Printing-Presses, of which the following is aspecification. v

The object of my inventionis to produce a simple and effective mechanismfor arresting the operation of a printing-press or other machine rundertheautomatic control of the successive sheets of paper which areoperated upon by the printing-press or other machine.

In feedingsheets ofv paper to a printingpress or -other machine thesuccessive sheets which are to be operated upon are placed upon thefeed-board of the printing-press or other machine in engagement with thefront guides of the machine and then registered laterally y by somesuitable side-registering device to properly position the sheets withrespectto the printing mechanism or other mechanism which is to operateupon the sheets.

The main feature of novelty in my present invention consists in theconstruction and arrangement of the press throw-out mechanism incombination with suitable side-registering mechanism and avsheet-actuated controlling device, whereby the throw-out mechanismunder the control of the sheet-actuated controlling device ,will beoperated by the sideregistering mechanism. In addition to thisv mainfeature my present invention comprises an improved construction ofsheet-actuated tripping device for controlling the throw-outmech'anismand other features of construction of the combined devices forproducing the desired result in a simplel and effective manner.

In order that my invention'may be fully understood, I will firstdescribe the same with reference to the accompanying drawings andafterward point out thenovelty with more particularity in the annexedclaims.

In the accompanying drawings, Figure 1 is adetail side elevation of myimproved automatically controlled -throw out mechanism applied to thefeed-'board of a printing-press. Fig. l is a detail side elevation ofthe controller-disk, showing it in shifted position withthe-electriccircuit broken. Fig. 2 is a detail plan viewA of the mechanism'shown inFig. l; Fig. 3 is a detail side elevation 'of part of the mechanismshown in Fig. l, representing the operating connection betweenmechanism.Fig. lOis aidetail transverse sectional View taken4 on the line a ci ofFig. 9.

Fig. ll is adetail plan view of parts of the` sideregistering device andits operating cambar.

1 is part of one of the sideframes of a printing-press of any suitableconstruction-J` 2 represents the" impression-cylinder of the, press,journaled in the side frames l upon the.

trunnions 3. Journaled in the bracket-arms extending vup from the sideframes l of the press, is a rock-shaft 5, upon which are mountf ed thefront guides ofthe press. Any suitable device may/be employed forrocking the shaft 5 foi-fthe purpose of throwing the front guides downinto gaging position and raising them into inoperative position atproper points in the operation of the press. l This mechanism is verycommon and well understood in the art and has not been illustrated. Thefront guides and cooperating devices will be hereinafter referred to. y

I have shown my improvements applied to a two-revolution press;V but itwill be clear to those skilled in the art that my invention isapplicableto any form of printing-press or other machine designed tooperate upon successive sheets ofpaper in which it is desired tocontrolthe operation of the machine by the correct `positioning of thesuccessive sheets. v

l0 is a feed-board of ordinary construction Fig. 9 is a detail planviewl representing part of the side registering Fig. L! is a viewsimilar to Fig.

suitably mounted in proper relatior'to the impression-cylinder 2 of theprinting-press. Projecting forwardly from the inner end of thefeed-board 10 are the under guide-lingers 11, which will be hereinaftermore fully referred to. A series of conveyer bands or tapes 15, passingover a roller 16, suitably journaled above the upper face of thefeedboard 10, are arranged to convey successive sheets of paper from anautomatic feedingmachine (not shown) to the printing-press. These bandsor tapes 15 deposit the sheet upon the feed-board with its forward edgein contact with the printing-press front guides in readiness for theoperation of the side-registering mechanism. This latter mechanism willnow be described.

The specific construction of the side-registering mechanism forms nopart of my present invention, and any suitable side-registeringmechanism may be employed in combination with the other deviceshereinafter referred to. For the purpose of illustrating my invention Ihave shown in the drawings and will 4now describe in a general way theside-registering mechanism covered by my Patent No. 669,724, grantedMarch 12, 1901, for improvements in sheet-conyeyer frames. The mechanismset forth in this patent comprises two laterally-operatingpaper-shifting grippers disposed in reverse positions in relation toeach other and adjacent to the opposite sides of the feed-board. Theoperating devices are constructed so that either one of theside-registering grippers may be employed, so that the sheets can beregistered from either side. I have shown but one of theside-registering devices. c' is one of the reciprocating transverse barshaving a spring 2 for moving it inwardly and supported in suitableguides on the brackets. The outward movement of the bar is effected bymeans of alongitudinally-movable cam-plate j', mounted in suitableguides. The cam-plate j is adapted to engage a roller j, carried by thebar t', for moving the bar/ outwardly. A rod R is connected with thecam-plate j and reeiprocatedA by any suitable cam mechanism, (notshown,) which may be operated from the feeding-machine. /c denotes thegri pper-shoe, which is formed with a longitudinal passage to receivethe marginal portion of the sheet of paper This gripper-shoe isadjustably mounted upon the bar t' in any suitable manner, such as setforth in my above-named patent, No. 669,724. N denotes thegripperfinger, which is fastened to a transverse shaft N', suitablyjournaled upon top of the gripper-shoe and in a bracket mounted upon thebar e'. To the other end of the shaft N is rigidly secured aradially-projecting lug m, and in .front and rear of said portion ofsaid shaft are posts m', projecting up from the face of the cam-platej', in which are adjustably mounted studs or tappets m2, disposed tostrike the llug m alternately upon opposite sides during thereciprocating` movement of the cam-plate j. The gripper-linger N hasarearwardly-extending arm O, and pivotally connected to the Jfree end ofsaid arm is a rod O,whieh passes diametrically through a barrel O2,pivotally supported upon the gripper-shoe 'f. A spring O, surroundingthe rod O', bears with its opposite ends on the arm O and barrel'O2 tocause the gripj'ier-{in ger to be thrown quickly past the center of itsmotion to produce a snap action, so as to quickly and irmly grip thepaper in the shoe or quickly release the paper. The operation of thisside-registering mechanism will be more clearly understood afterreferring to my above-named patent, No.669,724, the correspondingparlsof the structure being indicated in my present ease by the samercference-cliaracters that are used in said patent.

2O is a controller-disk journaled at 21 upon a suitable bracket22,seeured beneath the feedboard 10. The controller-disk 2() carries anelectric contact-arin 25, from which extends a circuit-wire 26. Mountedupon a bracket 27 is a spring contact 28, from which extends anothercircuit-wire, 29. The contacts and 28 constitute an electric switchwhich controls the electric circuit of any suitable electric motor whichoperates the printing-press or other machine which is to be controlled,or, if preferred, the electric switch may control any suitable electricdevice which is independent of the motive power of the press or othermachine and serves the purpose solely of throwing the press or othermachine into and out of operation. The speciic :form of the controllingmechanism is iimnatcrial to my present invention, and, in fact, it isnot essential whether the controlling mechanism is mechanical orelectrical, it being well understood in the art that the controller-disk2() may be connected in various ways, either electrically ormechanically, with any suitable controlling mechanism for producing thedesired result.

A rod 3() is journaled at 31 to the controllerdisk 2() and at 32 to arock-arm 33, which is in turn journaled at 34 to the bracket l). Byroeking the arm 33 rearwardly and forwardly the controller-disk ZO isrotated upon its journal 21 to break and make the contact of theelectric circuit for arresting and starting the operation of themachine. Projecting forwardly from the rock-arm 33 is a rod 40, which isjournaled to the rock-arm at 41 and carries an adjustable block ortappet 42 formed with a rear curved or caln face 42, and secured in thedesired adjusted position upon the rod 40 by any suitable means, such asa set-screw 43. The rod 40 is controlled by the mechanism presently tobe described. rhen the rod is in its lowermost position and thecam-plate j is moved rearwardly, a plate 44, projecting from the forwardpost fm', will engage the tappet 42, forcing the rock-arm 33 rearwardlyIOO IOS

tappet42 will not be engaged by the plate 44,

and the controlling mechanism will therefore not be operated. An uprightpost- 45 is mountedion a stationary part of the frame to one side of theline of travel of end of plate 44 and in the path of tappet 42. When thetappet 42, engaged byplate 44', is forced rearwardly for operating thethrow-out mechanism, the cam-face 42ab engages the post 45 and lifts thetappet 42 outl of engagement with the plate 44, thereby stopping themovement of bar and allowing cam-plate j tov complete its stroke.l l

is a rock-shaft suitably journaled in bracket-arms 51vabove the forward'edge of the feed-board 10. The rock-shaft 50 extends transversely ofthe machine. Keyed' to the rock-shaft 50 is a rock-arm formed with abifurcated or forked finger 53, in which rests the free end ofthe rod40. The fork of linger 53 guides the rod 40, whereas the u p-and-downmovement of rock-arm 52 raises and lowers the tappet 42 with respect tothe plate 44, carried by the post m. A spring 54 connects an arm or lug55 of rock-shaft 50 with a stationaryfpin 56 for imparting to therock-shaft 50 and its connected parts a spring tendency to move in onedirection. A rod 60 is jour naled at 6l tothe rock-arm`52 vand extendsdownwardly therefrom and carries' at its lower end anantifrictio-nLroller 62, which runs upon the periphery of a cam 63,journaled upon a supporting-arm 64 and having secured to it a gear 65,which is in constant mesh with a smaller gear 66, keyed to the axle 3 ofthe impression-cylinder. rlhe gears 65 and66 are in the proportion oftwo to one, so that the cam 63 willmake but one revolution for every tworevolutions of the impression-cylinder of i' face of the cam.

the press. The rod 60 is formed adjacent to its lower end with anelongated guiding-slot 60a, which works upon the journal of thecam 63, awasher 67 confining the rod 60 against the The cam 63 has a cut-out orlow portion 63, which allows the'spring 54 to raise rod 60 and rock-arm52 once in every revolutionof the cam 63. The high portion of the camdepresses the rod 60 and rock-arm v52 and holds them in depressed orlowered position against the tendency of spring 54 for the greater partof the revolution of cam63. 70 represents the front guides of theprinting-press adjustably mounted upon the arm 7l, which are securedupon the rock-shaft 5, above referred to. Each front guide 70 iscentrally cut out at 7l to allow'the free passageof the tripping-arm 72, which is freely journaled upon the lower end of the rockarm 73,depending from and keyedto the rockshaft 50. i

Each of the front guides 7 O rests, when in gaging position, upon one ofthe under guides 11. The under guides are constructed, a's' shown inFigs. 6, 7, and 8 of the drawings, with the longitudinal slot lla, inwhich is mounted an adjustable stop-plate 7 5,'formed` with a tapereddepression 76, having a shoulder 77. The stop-'plate 75 is adjustablyse` .cured in the slot of the under guide by means of a countersunkset-screw 78, which passes through the stopplate 7 5and is threaded intoa lower plate 79. The walls of the slot 1la are beveled, asshown, andthe edges o f stop-plate'75 and lower plateV 79 are correspondinglybeveled, so as to be supported iiush with the surfaces of the underguide. The purpose of stop-plate 77, which is mounted in the samevertical plane as the trippingarm 72, is to engage the end of thetrippingarm to prevent its forward movement over the under 'guide when asheet is not in proper position for feeding to the press.

The operation of my improved sheet-controlled throw-out mechanism willVbe clear .fromthe following explanation: The succesof the press, whichare in lowered position at such times.n If a Vsheet reaches the properregistered position against the front guides, it is registeredlaterally` by the side-register ing mechanism above described inthe'manner fully set forth in my above-named patent, No. 669,7 24. Whilethe sheet is being fed into registered position against the 4frontguides the trippingarms 72 are Aheld in their rearmost position byreason of the fact that the high part of the cam 63 will be inengagementv with the anti friction-roller 62, carried by rod 6C).AImmediately after the sheet has reached the front guides 70 the lowportion 63iL of cam 63 reaches antifriction-roller 62 and allows'spring54 to move the tripping-fngers 72 forwardly. position, it will be clearthat the forward ends of the tripping-fingers will slide upon the sheetand pass over the shoulders 77 in the stopiplates 75. The movement ofthe rockshaft 50, under action of spring 54, to cause 1 thetripping-fingers 72 to move forwardly also effects'the raising ofthe'rock-arm 50, which in turn lifts the rod 40 to cause it to movetappet 42 out of the path of the arm 44, carried by the post m. Thesheet is then regis- IOO The sheet being in registered tered laterally,andthe throw-out mechanism will not'operate. If, however, a sheet failsj to reach the registered position at the moment that rock-shaft 50 ismoved'by spring 54, it f will be clear that the forward Vend of one ofthe tripping-lingers 72 will slide into engagement with 'shoulder 77ofthe stop-plate and-vl prevent the further movementof shaft 50. Thiswill hold the rock-arm 52 in its lowered position, which willallow thethrow-out-op-` erating rod 40 to also remain in lowered pof'sition, sothat when the slide'j of the side` registering mechanism movesrearwardly the arm 44 will engage the tappet 42 and force the rock-arm33 rearwardly, which will in turn move the controller-plate 2O upon itsbearing, with the result that the circuit will be broken at contacts 25and 28, and the machine will be thrown out of operation, as aboveexplained.

While I have shown in the drawings and specifically described one of thesheet-actuated tripping devices for controlling` the throw-outmechanism, l would have it understood that `two of such devices areemployed, one at each side of the line of feed of the sheets in thevertical planes of the usual under guides and front guides with whichprinting-presses are equipped. Both of these tripping devices controlthe throw-out mechanism, so that the press will be tripped when thesheet fails to reach registered position at either side. rI`hus when asheet is fed at an angle to the front guides only one of the trippingdevices would be actuated, and the press would be thrown out.

I desire to claim, broadly, an automatically-controlled throw-outmechanism for a printing-press or other machine designed to operate uponsheets of paper passed through it in combination with a side registeringmechanism, operating' means for the sideregistering mechanism adapted toalso operate the throw-out mechanism, and a sheetcontrolled trippingdevice adapted to operatively connect and disconnect the stop mechanismand the operating' means of the sideregistering mechanism. I also desireto claim the specific form of sheet-actuated tripping device and themeans for operating it, as above described.

Having thus described my invention, the following is what I claim as newtherein and desire to secure by Letters Patent:

l. In combination with a machine designed to operate upon sheets ofpaper passed through it, and stop mechanism adapted to automaticallyarrest the operation of said machine, suitable side-registeringmechanism for the sheets, means engaged and operated by theside-registering mechanism for actuating the stop mechanism, and asuitable sheet-actuated tripping device controlling the engagement ofthe actuating means of the stop mechanism by the side-registeringmechanism, substantially as set forth.

2. In combination with a machine designed to operate upon sheets ofpaper passed through it, and stop mechanism adapted to automaticallyarrest the action of said machine, suitable side registering mechanismfor the sheets, a reciprocating slide adapted to operate the registeringmechanism, a part connected with the stop mechanism adapted to beengaged and operated by said reciprocating slide to actuate the stopmechanism, and automatically-controlled means for moving said part intoand out of operative relation with said slide, substantially as setforth.

3. .ln combination with a machine designed to operate upon sheets ofpaper passed through it, and stop mechanism adapted to automaticallyarrest the operation of said machine, suitable side-registeringmechanism for the sheets, a part connected with the stop mechanismadapted to be engaged by the sideregistering mechanism for actuating thestop mechanism, and automatically -controlled means for moving said partinto and out of operative relation with the side-registering mechanism,substantially as set forth.

4. In combination with a machine designed to operate upon sheets ofpaper passed through it, and stop mechanism adapted to automaticallyarrest the operation of said machine, suitable side-registeringmechanism for the sheets, operating means for the side-registeringmechanism, and a suitable sheet-controlled tripping device adapted tooperatively connect and disconnect said stop mechanism and saidoperating means, substantially as set forth.

5. In combination with a machine designed to operate upon sheets ofpaper passed through it, and stop mechanism adapted to automaticallyarrest the operation of said machine, suitable side-registeringmechanism for the sheets, operating means for the side-registering`mechanism adapted to also actuate the stop mechanism, a shiftable partinterposed between said operating means and said stop mechanism, and asuitable sheet-controlled tripping device constructed and arranged tocontrol said shiftable part to connect or disconnect the stop mechanismand operating means, substantially as set forth.

6. In combination with a machine designed to operate upon sheets ofpaper passed through it, and stop mechanism adapted to automaticallyarrest the operation of said machine, suitable side-registeringmechanism for the sheets, a part connected with the stop mechanismadapted to be engaged by the side-registering mechanism for actuatingthe stop mechanism, means for moving said part into and out of operativerelation with the registering mechanism, and a sheet-actuated trippingdevice adapted to retain said part in its operative relation with theregistering mechanism, substantially asset forth.

7. In combination with a machine designed to operate upon sheets ofpaper passed through it, and stop mechanism adapted to automaticallyarrest the action of said machine, suitable side registering mechanismfor the sheets, a part connected with the stop mechanism and adapted tobe engaged and operated by the said registering mechanism, aspringactuated device adapted to move said partout of engagement withthe registering mechanism and hold it normally in said disengagedposition, means for operating said spring-aclOO lIO

anism and adapted to be engaged and operated by the said registeringmechanism, a springactuated device adapted to move said partout ofengagement with the registering mechanism and hold it normally inposition, means for operating said spring-actuated device to cause saidpart of the stop mechanism to move into operative relation -With theregistering mechanism, ra sheet-controlled tripping-finger suitablyconnected with said spring-actuated device and adapted to restrain saidspring-actuated device to allow the throw-out to operate, and a devicewith which said trippingfinger is adapted to engage in the absence of asheet, substantially asset forth.

9. In combination with a machine designed to operate upon sheets ofpaper passed through it, and stop mechanism adapted to automaticallyarrest the action of said machine, suitable sideregistering mechanismfor the sheets, a part connected with the stop mechanism and adapted tobe engaged and operated by the said registering mechanism, a deviceadapted to automatically move said part out of engagement with theregistering mechanism and hold itnormally in said disengaged position,means for operating said device to `cause said part of the stopmechanism to move into operative relation lwith the registeringmechanism, and a sheet-actuated tripping device arranged to normallyprevent the operation of said device, substantially as set forth.

l0. ln combination with a machine designed to operate upon sheets ofpaper passed through by the said registering mechanism, a deviceyadaptedto automatically move said part out of engagement with theregistering mechanism and hold it normally in position, means foroperating said device to cause said part of the stop mechanism to moveinto operative relation with the registering mechanism, asheet-controlled tripping-fingery suitably connected with said deviceandadapted to restrain said device to allow the throw-out to operate,

and a device with which said tripping-finger is adapted to engage in theabsence of a sheet, substantially as set forth. v

11. In a mechanism of the character described,the combination ofsuitable throw-out mechanism, including an operating-arm, areciprocatory bar with whichsaid arm is adapted to engage, atappetcarried by said operatingarm, means for moving said operating-arm tobring said tappet into and out of operative relation with theoperating-bar, and means for automatically disengaging the tappet fromsaid operating-ban@substantially as set forth.

12. In a mechanism of lthe character described,the combination ofsuitable throw-out mechanism, inclu'ding'an operating-arm, areciprocatory bar with which said arm is adapted to engage, a tappetcarried by said operatingarm, means for moving said operating-arm tobring said tappet into `and out of operative relation with the operatingbar, means for maintaining said arm in its operative position, and meansfor automatically disengaging the tappet from said operating-bar,substantially as set forth. n y

13'. In a mechanism ofthe character described, the combination ofsuitable throw-out mechanism, an operating-bar, an operatingarm engagingwith the throw-out mechanism, a tappet mounted upon said operating-armand adapted to be engaged by said operating-bar,

said tappet beingformed witha rearwardlypresented cam-face, a stationarypost adapted to engagey the cam-face of said tappet to disengage it fromthe operating-bar, means for moving said arm into and out of operativerelation withthe operating-bar, and a sheet-actuated tripping deviceadapted to maintain said arm in its operative position, substantially asset forth.'

14. In combination with amachine designed to operate upon sheets ofpaper passed through i it, stop mechanism adapted to automaticallyarrest the operation of said machine, means for operating said stopmechanism, and a part connected with the stop mechanism and adapted tobe moved into and out of operative rey lation with the operating means,with a springactuated vrock-shaft, an arm upon said rockshaft adapted tomove said part of the stop mechanism into and out of operative relationwith said operating means, 'a sheet-actuated tripping device adapted toretain said rockshaft and its arm in position to cause the operation ofthe stop mechanism, and means upon the controlled machine through whichthe sheets are fed for moving said rock-shaft and arm into position tocause theoperationof the stop mechanism, substantially as set forth.

IOO

15. In combination with a machine designed bar out of operative relationwith said operating means, suitable cam mechanism upon the controlledmachine through Which the sheets of p aper are passed, suitableconnection between said cam mechanism and rock-shaft for moving said`rock-arm against the action of said spring into position to allow saidrod or bar to rest in operative relation with said operating means, anda sheet-actuated trippingdeviee adapted to retain said operating rod orbar in said operative position, substantially as set forth.

16. In combination with a controlled machine designed to operate uponsheets of paper passed through it, suitable stop mechanism adapted toautomatically arrest the operation of said machine, means for operatingsaid stop mechanism, and a rod or bar connected with said stop mechanismand adapted to be moved into and out of operative relation with saidoperating means, With a spring-actuated device adapted to move said rodor bar into its inoperative position, means upon the controlled machinethrough which the 'sheets are passed adapted to move saidspring-actuated device against the action of its spring to allow saidrod or bar to rest in operative relation with the said operating means,and a sheet-actuated tripping device adapted to retain saidspringactuated device in position to allow the operation of the stopmechanism, substantially as set forth.

17. In combination with a machine designed to operate upon sheets ofpaper passed through it, a stop mechanism adapted to automaticallyarrest the operation of said machine, a reciprocatory operating-bar, anda part connected with the stop mechanism adapted to be moved into andout of operative relation with said operating-bar, with a sheet-actuatedtripping device controllingl the movements of said part of the stopmechanism and comprising` a reciprocating triparm mounted above the pathof the sheets and a stop-plate mounted beneath the path of the sheetsand formed' with a depression in which said trip-finger is adapted toengage in the absence of a sheet, substantially as set forth.

18. In combination with a machine designed to operate upon sheets ofpaper passed through it, a stop mechanism adapted to automaticallyarrest the operation of said machine, a reciprocatory operating-bar, anda part connected With the stop mechanism adapted to be moved into andout of operative relation with said operating-bar, with a sheet-actuatedtripping device controlling the movements of said part of the stopmechanism and comprising a reciprocating trip-arm'mounted above the pathof the sheets and a stop-plate .mounted beneath the path of the sheetsand formed with a depression in Which said trip-ingeris adapted toengage in the absence of a sheet, said stop-plate being adjustable inthe direction of the reciprocation of the trip-arm, substantially as setforth.

19. In combination with a machine designed to operate upon sheets ofpaper passed through it, a stop mechanism adapted to automaticallyarrest the operation of said machine, with a sheet-actuated trippingdevice controllingl the operation of the stop mechanism and comprising aspring-actuated rock-shaft suitably connected with the stop mechanismfor controlling its operation, a rock-arm carried by said rock-shaft, areciprocating trip-arm pivotally mounted upon said rock-arm above thepath of the sheets and adapted to reciprocate in the path of the sheets,and a stop-plate mounted beneath the path of the sheets and formed witha depression in which the end of the triparm is adapted to engage in theabsence of a sheet, substantially as set forth.

20. In combination -with a machine designed to operate upon sheets ofpaper passed through it, a stop mechanism adapted to arrest theoperation of said machine, a support for sheets fed to said machine, atripper-stop upon the sheet-support, and a trip-arm mounted above thesheet-support and movable back and forth thercovcr and adapted to engagesaid tripperstop in the absence of a sheet between them, and meanscontrolled by said trip-arm for causing the operation of said stopmechanism, substantially as set forth.

2l. In combination with a machine designed to operate upon sheets ofpaper passed through it, a stop mechanism adapted to arrest theoperation of said machine, a support for sheets fed to said machine, apart upon the sheetsupport in the plane of feed formed with a depressionand a tripper stopor shoulder, and a trip-arm mounted above thesheet-support and movable back and forth thereover and adapted to entersaid depression and engage said tripper-stop in the absence of a sheetbetween them,and means controlled by said triparm for causing theoperation of said stop mechanism, substantially as set forth.

22. In combination with a machine designed to operate upon'sheets ofpaper passed through it, a feed-board, front guides adapted to arrest asheet in registered position with relation to the said machine, astop-plate mounted upon said feed-board and formed with a depression, areciprocating trip-arm supported above the feed-board and adapted toengage in said depression of the stop-plate in the absence of a sheetbetween them, suitable stop mechanism adapted to automatically arrestthe operation of' said machine, and means controlled by said trip-armfor causing` the operation of said stop mechanism, substantially as setforth.

23. In combination with a machine designed to operate upon sheets ofpaper passed through it, a feed-board, under guides projecting from theforward end of said feed-board, front IOO guides cooperating with saidunder guides and `having slots cut through them, stop-plates mountedupon the under guides and formed with depressions, trip -arms mountedabove the feed-board vand adapted to reciprocate above the stop-platesand through the slots of the front guides, suitable stop mechanism yadapted to automatically arrest the operation operation, a movingcontroller the arrest of.

which renders said mechanism active, and a fixed stop for saidcontroller so arranged that the engagement of the controller therewithis prevented by the sheet.

25. Mechanism for controlling machines operating upon sheets having incombination, a stop arranged to be covered by theI sheet when in properposition, a reciprocating' controllerfinger arranged to be guided overthe stop by the sheet, 4and stopping mechanism thrown into action by thearrest of said finger.

26. Mechanism for controlling machines operating upon sheets, having incombination, throw-out mechanism for the said machine, operating meansfor the tlirow-out mechanism, a sliiftable part interposed between saidoperating means and said throw-out mechanism, a controller for saidshiftable part, and a controller-stop so arranged that the engagement ofthe controller therewith isv prevented by the sheet when in properposition, as set forth.l

27. Mechanism for controllingmachines operating upon sheets, having incombination tlirow-out mechanism for thesaid machine, operating meansfor the tlirow-out mechanism, a part movable into and out of engagedposition interposed between said operating means and said tlirow-outmechanism, a-stop larranged to be covered by the sheet when in properposition, a reciprocating controllerlinger arranged to be guided overthe stop by the sheet, and a guard-arm connected to and movablev withsaid controller-finger and controllingthe action of said interposedmovable part, as set forth.

28. In combination with a machine designed to operate upon sheets ofpaper passed through it, a stop mechanism adapted to automaticallyarrest the operation of said machine, with a sheet-actuated trippingdevice controlling the operation of the stop mechanism and comprising ayieldingly-actuated rock-shaft suitably connected with the stopmechanism for controlling its operation, a rock-arm carried by saidrock-shaft, a reciprocating trip-arm pivotally mounted upon saidrock-arm above the path of the sheets, and a stop-plate mounted beneaththe path of the sheets and formed with a depression in which the end ofthe triparm is adapted to engage in the absence of a sheet,substantially as set forth.

29. Mechanism'for controlling machines operating upon sheets, having incombination, normally inactive throw-,out mechanism for lthe saidmachine, normally active operating ymeans for said tlirow-out-operatingmechanism, a part connected with thestop mechanism adapted to be engagedand operated by said operating means, a yieldingly-actuated devicenormally preventing the engagement of said part by said operating means,a controlling-finger connected with and actuated byV saidyieldingly-actuated device, and a stop with which saidcontrolling-finger is adapted to engageto arrest saidyieldingly-actuated device and cause the engagement ofy said partl bysaid operating means. the engagement of said linger with said stop beingcontrolled by the sheet, as set forth.

30. Controlling mechanismA for machines designed to operate upon sheets,having in combination a throw-out mechanism for the said machine,operating means for said throwlout mechanism, coacting members connectedrespectively to the throw-out mechanism and its operating means, one ofsaid coacting members being movable into and out of engagement with theother coacting member for connectin g and disconnecting the throw-outmechanism and itsoperating means, a rock-arm engaging the movablecoacting member for holding. it lout of engagement with the othercoacting member, means controlled by tlie sheet suitably connected withsaid rock-arm for controlling its operation and determining whether thethrow-out mechanism shall operate, substantially as set forth.

IOO

.. 31. Controlling mechanism'for machines designed to operate uponsheets, having in combination a throw-out mechanism for the saidmachine, operating means for said throwout mechanism, coacting membersconnected I respectively -to the throw-out mechanism and Y.

its operating means, one of said coacting members being movable into andout of engagement with` the other coacting member for connecting anddisconnecting the throwout mechanism and its operatingA means, ayieldingly-actuated device engaging the movable coacting member forholding it outof engagement with the other coacting member, meanscontrolled by the sheet'suitably connected with said yieldingly-actuateddevice for controlling its operation and determining whether thevtlirow-out mechanism shall op-l erate, substantially as set forth.

TALBOT c. DEXTER.

Witnesses:

. J. GREEN,

WM. E. KNIGHT.

